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Complete mitochondrial genomes reveal Epigonichtys and Asymmeron are distinct genera of lancelet

【摘要】:正Epigonichtys and Asymmeron are genera of lancelet.and there is a dispute about their consolidation.Mitochondrial DNA is generally considered to be a powerful genetic marker in taxonomic studies.To date,complete mtDNAs of 8 cephalochordate species are available including Branchostoma floridae,B.lanceolatum,B.belcheri,B.japonicum,Epigonichthys maldivensis,Asymmetron lucayanus,A.inferum and A.lucayanus sp.In the present investigation, we sequenced the complete mitochondrial DNA of Epigonichtys cultellus and compared the mitochondrial genomes of nine lancelet species to clarify the taxonomic status of the genera.The mtDNA of Epigonichtys cultellus also contains 13 protein-coding genes,22 tRNA genes and 2 rRNA genes,and has the same gene order as most other lancelets except Asymmetron species. P-distance of amino acid sequences was calculated using MEGA and phylogeny tree of amino acid was constructed using neighbor-joining method with Poisson correction model.The average genetic distance of protein sequences within genera Branchostoma,Epigonichtys and Asymmeron is distinctly smaller than that between any two genera.The phylogenetic analysis based on concatenated amino acid sequences revealed distinct genetic gaps among the three genera.The data from the mitochondrial genome comparison demonstrated that Epigonichtys and Asymmeron should be two separated lancelet genera.

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